1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
1.4 Specific Gravity
1.8 Fracture
Uneven, Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001)
Uneven, Brittle, Metallic, Brittle, Metallic, Brittle, Metallic
1.9 Cleavage
Perfect {010}, imperfect {100}
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
1.10 Mohs Hardness
1.12 Chemical Composition
Ca2Al3(SiO4)3(OH)
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.